Ten miners emerged from the mine shaft near Johannesburg on Monday, one day after emergency responders rescued a group of 11, the South African Press Association reported. The men were in good health and rescue workers handed them over to police.

Emergency workers have said some of the miners who were working illegally were reluctant to come out of the shaft because they feared arrest.

The trapped miners were discovered after police patrolling in the area heard shouting beneath a mine entrance that had been blocked by a large boulder, according to local media.

"We had men who came halfway up the shaft but then turned around. Our rescue members cannot go down the shaft because it is too dangerous," the South African news agency quoted rescue worker David Tshabalala as saying.

It was unclear how many other miners were still below ground because those who have come out have not divulged information, he said. Food and water were sent down to the miners on Sunday.

"We will wait to see what the other miners that have been rescued can tell us and maybe we can negotiate with" the miners who remain underground, said Sugan Moodley, a spokesman for emergency services.

Penalties for illegal mining include fines and prison time in some cases. Illegal mining is common in South Africa, a major producer of gold and platinum.